Rename pkg/{tagging,lifecycle} to pkg/bucket sub-directory (#8892)

Rename to allow for more such features to come in a more
proper hierarchical manner.

pkg/bucket/policy/condition/name.go

@@ -0,0 +1,99 @@
+/*
+ * MinIO Cloud Storage, (C) 2018 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package condition
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type name string
+
+const (
+	stringEquals              name = "StringEquals"
+	stringNotEquals                = "StringNotEquals"
+	stringEqualsIgnoreCase         = "StringEqualsIgnoreCase"
+	stringNotEqualsIgnoreCase      = "StringNotEqualsIgnoreCase"
+	stringLike                     = "StringLike"
+	stringNotLike                  = "StringNotLike"
+	binaryEquals                   = "BinaryEquals"
+	ipAddress                      = "IpAddress"
+	notIPAddress                   = "NotIpAddress"
+	null                           = "Null"
+	boolean                        = "Bool"
+)
+
+var supportedConditions = []name{
+	stringEquals,
+	stringNotEquals,
+	stringEqualsIgnoreCase,
+	stringNotEqualsIgnoreCase,
+	binaryEquals,
+	stringLike,
+	stringNotLike,
+	ipAddress,
+	notIPAddress,
+	null,
+	boolean,
+	// Add new conditions here.
+}
+
+// IsValid - checks if name is valid or not.
+func (n name) IsValid() bool {
+	for _, supn := range supportedConditions {
+		if n == supn {
+			return true
+		}
+	}
+
+	return false
+}
+
+// MarshalJSON - encodes name to JSON data.
+func (n name) MarshalJSON() ([]byte, error) {
+	if !n.IsValid() {
+		return nil, fmt.Errorf("invalid name %v", n)
+	}
+
+	return json.Marshal(string(n))
+}
+
+// UnmarshalJSON - decodes JSON data to condition name.
+func (n *name) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return err
+	}
+
+	parsedName, err := parseName(s)
+	if err != nil {
+		return err
+	}
+
+	*n = parsedName
+	return nil
+}
+
+func parseName(s string) (name, error) {
+	n := name(s)
+
+	if n.IsValid() {
+		return n, nil
+	}
+
+	return n, fmt.Errorf("invalid condition name '%v'", s)
+}